using Bridge.Html5;
using Retyped;
using System;
using Bridge;
using static Retyped.ace;

namespace LearnBridgeNet.Components
{
    public class AceEditor
    {
        private readonly HTMLDivElement _dom;
        private readonly AceAjax.Editor _aceInstance;

        private AceEditorTheme _theme;
        private AceEditorMode _mode;
        private int? _width;
        private int? _height;
        private CssUnit _widthUnit = CssUnit.Pixel;
        private CssUnit _heightUnit = CssUnit.Pixel;
        private int _fontSize;
        private CssUnit _fontSizeUnit;


        [Init(InitPosition.Top)]
        public static void Patch()
        {
            //A pacth of retyped.ace type define
            /*@
                if (window.AceAjax === undefined) window.AceAjax = {};
                if (window.AceAjax.Editor === undefined) window.AceAjax.Editor = function () { };
            */
        }

        public AceEditor(HTMLDivElement dom)
        {
            DebugSupport.Add(this);

            _dom = dom;
            // ReSharper disable once SuspiciousTypeConversion.Global
            _aceInstance = ace2.edit((dom.HTMLDivElement)(object)dom);


            SizetUnit = FontSizeUnit = CssUnit.Pixel;
            Width = 800;
            Height = 600;
            FontSize = 16;
            _aceInstance.resize();

            Theme = AceEditorTheme.Chrome;
            Mode = AceEditorMode.Markdown;

            _aceInstance.on("change", o =>
            {
                OnChange();
                return null;
            });
        }

        public event EventHandler Change;

        public string Value
        {
            get => _aceInstance.getValue();
            set => _aceInstance.setValue(value);
        }

        public void AddClass(string name) => _dom.ClassList.Add(name);

        public void RemoveClass(string name) => _dom.ClassList.Remove(name);

        public AceEditorTheme Theme { set => _aceInstance.setTheme("ace/theme/" + (_theme = value)); get => _theme; }

        public AceEditorMode Mode { set => _aceInstance.session.setMode("ace/mode/" + (_mode = value)); get => _mode; }

        public int? Width
        {
            get => _width;
            set
            {
                if (null == value)
                {
                    _width = null;
                    _dom.Style.Width = null;
                    return;
                }
                _dom.Style.Width = (_width = value).Value + _widthUnit.ToString();
            }
        }

        public CssUnit WidthUnit
        {
            get => _widthUnit;
            set
            {
                _widthUnit = value;
                _dom.Style.Width = null == _width ? null : _width.Value + _widthUnit.ToString();
            }
        }

        public int? Height
        {
            get => _height;
            set
            {
                if (null == value)
                {
                    _width = null;
                    _dom.Style.Height = null;
                    return;
                }
                _dom.Style.Height = (_height = value).Value + _heightUnit.ToString();
            }
        }

        public CssUnit HeightUnit
        {
            get => _heightUnit;
            set
            {
                _heightUnit = value;
                _dom.Style.Width = null == _height ? null : _height.Value + _heightUnit.ToString();
            }
        }

        public CssUnit? SizetUnit
        {
            get => _widthUnit == _heightUnit ? (CssUnit?)_widthUnit : null;
            set
            {
                if (null == value) return;

                _heightUnit = value.Value;
                _widthUnit = value.Value;

                _dom.Style.Width = null == _width ? null : _width.Value + _widthUnit.ToString();
                _dom.Style.Width = null == _height ? null : _height.Value + _heightUnit.ToString();
            }
        }

        public int FontSize { set => _aceInstance.setFontSize((_fontSize = value) + _fontSizeUnit.ToString()); get => _fontSize; }

        public CssUnit FontSizeUnit { set => _aceInstance.setFontSize(_fontSize + (_fontSizeUnit = value).ToString()); get => _fontSizeUnit; }

        protected virtual void OnChange()
        {
            Change?.Invoke(this, EventArgs.Empty);
        }
    }
}